Depressed and on the verge of "giving up"

Hi, you don't know me nor have I ever spoken to you before.

But I stumbled across you because I literally typed into google "Suicidal and depressed" and I guess you can tell how I've ended up here now.

You seem like a really nice person, and someone who is approachable, and in my situation there is nobody like that.

I dunno... I just never feel content with how my life is. I'm never happy, im constantly tired I always feel like I should be making the most of my life as im 21 ... but there isn't anyone around. I'm so lonely

I wouldn't even know where to start to explain how unsatifised I am with life... but if this is all I got (which is to spend time alone, then I'd rather just kill myself as whats the point in staying alive alone/bored/upset whilst everyone else is out enjoying themselves, im just a burden that doesn't need to exist anymore.

I dont know who to turn to, im so afraid of my future... all I see is failure, loneliness, unfulfilled and unhappiness